I assume you mean 3.5 grams. 3.5g is 3500 milligrams
The answer depends on what a mili foot or mili feet is. Mili is not a mathematically recognised prefix and so it is difficult to give a straightforward answer.
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1kg = 1000g kg = kilogram g= gram
10,000
6800
1000ml = 1L
1000
473.17 ml
1609344 mm
1000
mili is 1000 so.... 1000 mili/ 1 m
Normally one.